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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbd3f59d94f9f78fda68f1672bbc05f8aed6d62a79442433317cd0059ffc2cc' 
  AND token = 'BYS15vGhh47z916zln1Pzyoi5IE5i861ecsjmlTghN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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