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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd28d364e2ec34e8b9dcac1ff0bf396440f0e13f6b79ae376ec4d5a1a9971499' 
  AND token = 'fl9to0W3mDaG9InrCAHxH/3G7KlcmB7c4IWAcrKs7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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