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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62d8997b2097acaeafdd154bd5ccfe60011dc8348871e2629c8392ed1819051' 
  AND token = 'GlIvv8QGb2m8PzzrWWGQ+4lRtt1Nsk+Kv7hMIW36tpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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