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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e483b4ddd0ea12c1f72eed6e0514719557a1495241a235121cadab1fa04c1c' 
  AND token = '17d3nNFEHE+i4Z6txFFw35a7JiuHyZwau26HaYTe6/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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