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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80da7a81661fe92a11e38108e1ba1f21fa85a7139453b25497100a4f6e408d74' 
  AND token = '73R3sZTijC+qEZJdMuQMep40cfAXuvxSzVsViUjFJG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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