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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab21b65f941cc56cc043cc993a139d268ec7ccce9da9d47996b95fccdad5a39' 
  AND token = '5mVssXoqxNX9qR1/iJLAZYl50+T6ei7uyJ1l2YDWBXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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