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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e096e6ef873236725edef1d282f2aedcf23bd125e21c15e27e106b4829c2d15d' 
  AND token = 'SmuuVLKDtCQqSFfUM49l361/Clsatn5oGo+Ibc8F9ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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