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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8292ad08bab1cc5756fc1107e0e958c835381350c5704c84440426d30b682c0' 
  AND token = 'hinFDQfEmlAKJmfmA95ISU5p/9mPKmKUGxxG4SPnvpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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