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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81bd4a5c3cdfd8cf014598b1cd560f8a1daf13edb13ad3aac7c43c5a4020658' 
  AND token = 'Wn97xpfabtzA7EWseXli1Flm0J+X9VGRVOpiAdDLtNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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