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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada2956a77382ba79090a0ec27ce4f06257db185fe8cc2e1ce5cfde86fed5fe0' 
  AND token = '5pcEs302LKtY8TF945494O09Q39rnU3RjA5+/fbtzzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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