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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190dbaccfe9bf2f220d225c38feb191245d2d5819f150499f1e41f36b43990bb' 
  AND token = 's0MKkkBGSFG8h62CoxM64CRsZp6XTEyK1CHsQXFWfS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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