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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe0edc06d29a6245cea9315900aa16e7b42de7fa381854b2c5b483039e37dba' 
  AND token = 'JHzCLP9p/yd+SXwnxFnFzNVZSRq9Ag3D6cRDEQCW7AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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