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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b09dcdb6e645b0db27ac4a0f16bfc00b72546d202d86cfbaef87c9c6ac39d5' 
  AND token = 'uov/4uhMEF7pMsNQ+jV6bG2t6lDkeNIzMDgCLJyQqFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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