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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7db460dd006302963f1a36f1770dfa9fdb2e6e4e41a751e4bc99fc37f2c5d54' 
  AND token = '8C5sj7axiPzC3Iisd84nA96ezHFmGvCHTHgQpO39b+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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