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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd16c17ea1fef50c36dcd6c7bc695fa10af4036d231c3d0923f5441b77bfa98' 
  AND token = 'F7nSKe1czbZMLdKe4aJUgiEPkDHD5h2S3Yjn9ZUGv0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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