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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61c03637fa5aa8f5abde202249cafff6562e1420d214687c676660cafaddb0f' 
  AND token = 'Ne3Ut9c51+Hhp3KVL4TgOBqMU6hvmcMuhEiqDoCx/Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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