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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a7dc02bebadcfb174dabe5da2633976f7d45dc12f899722ca868250f08ab71' 
  AND token = '9qh1jP/vDWGMXAUqckmv4EoHOThpz2c3hcFrougTep4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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