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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7424d34fb59d35636cb7c81f69dd7f3bf9886eba66817d66e604e52b120c06' 
  AND token = 'e6gCbIHcopx/llMNgg8Jngqm+ksM9vTfoaKNq7gM0hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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