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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a80f4415d6d520757b5385936e2975f1135301c8c85ba457458f47d7142b4ee' 
  AND token = 'Iduu9tHXoznqGUF6J40mvMkv1Tq96ScABQpkPOMMukw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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