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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf7af4f636b72d88589f7fae5bbc8770ca41f01bdee041dc1b266eb02c00b26' 
  AND token = 'Fqn9pTbXAcEK+PCcfwMHp4rnDVLC/hv1hBiaZ7edvG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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