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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0072d64602fc24b920e61fc0ecc2c1740f8ef0cd6bcb268bef20b812ebe4c8c5' 
  AND token = '4As4mHcI8S4tomrWFpF8ZlSZD4AN16/fABfFkCp5btk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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