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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ae60a5a64bdb6d4d19bd399e92d0d9a03c72aeec17947810e2c2ea095979fe' 
  AND token = 'IsU+qpN17qXa01wPi5vibeItUbSLJc9g3CUEyXLAUzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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