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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7990e626865919a69fe3d59c6aaf35872986b471e61a4232f5ef4361248c1770' 
  AND token = 'xyhhilzjsJ1blZEyducabGy3r4T+OOiR20Xw9SEZzAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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