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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b2fbb2219d419457679cd433236040511f9ea3d7b0f3479689f83264130510' 
  AND token = '9kYQKMlXVST0E62J+9zU0wZ4ikk4vAZJbnB4n1moD5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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