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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08355dc4dfaf2debdada335dee4944bf20eafb1ec8db12266eb5c8c8892fea4d' 
  AND token = 'BLaORkF3g6rGnnZqnRakHr0aGqh/Y8gz5vt97W+4IaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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