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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5235055c150da77bf6d0078fe2bea4110964a306450076c2aff1f4f53c0a74' 
  AND token = 'uXZAAMw0NMabAc9wq5meEIykFMLMTBMUIxvqd4ifC30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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