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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2a2fac7c017f0d24ff0ad016a3a67f69f4c765dae1a899b0d5da2ffa88f647' 
  AND token = 'vpU7PE1chqEsvuquMwcM6xuKIbZcIA/s/GO1z8QUOvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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