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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccac5c7f9414f4342370c56a0cef7a5af6b6420bd1597d7aee69abb7934d11d' 
  AND token = 'zBXjiC+fiBWNNM5mPhQ5eL21p8R6oeGBk65Q2fOhWc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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