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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1f3b07e0ea28728465ebb66ccdd19f204269373cd0165ab7d4b51510251d42' 
  AND token = 'b9D1dGqNvuCb3xo18X6gFkvsGPh5L8OlAL5zv5KuDto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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