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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776516a4d9f51ea96acaffd9783487b7b702546a20a76dcaf686f1a438f83d6e' 
  AND token = 'NX0O1miNgYVbMsQJtCxrFJ8UjXGw62QUu2VCAQC/UdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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