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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bd2e6e95fcd8eb89b75ab17a4f776205409228a63c7a6c9a8ccd3f046388b0' 
  AND token = 'Ks395Ef15kaFDqB3nSRz719DJz4qEcIb23nPF7YTsrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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