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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec9430eb085a1ff93e61c1857d0f23e659edda7cee987e6860e086dfc1e1ee7' 
  AND token = 'ZtvWlJ2lOtCFLvtWDWSn20dfh4guX8ZZpgOiqWhI5WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}