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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d878804081c1049ab559653715e244122daebcf8c7ae1638779a3f865e9e1cc' 
  AND token = '9ZapXyOkattKEADz2a5lzB5QZetSuBch9bre1BUxMs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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