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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f51cb46b137c5d4a10c81b5c9c011d22cf803b0e437edae8450d370fde08ca' 
  AND token = 'Pi/s0b8H2zZz0hA56wc1uK6QVkgKSzDIfjPRWXhfZTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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