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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd6e096172a47d10bb1237e94d8607e5773cc5a2057d50c1fe11512b38c9ea4' 
  AND token = 'aSLYZ267kgmQFUIcW1m5HzZZfFMi7Gc6Sf2DwK+Tk4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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