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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33d3d890a986545b371f03e16c7ff7b6764d107befed035ccab96d3ee092514' 
  AND token = 'XCAT5FFfOHgxh/SaEKSQw1bzm92PufgjdZ3Fap3JdmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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