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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3368ca253db1247cd02da0d8f78a26f46b1be659b553ea83801b2151a9db8914' 
  AND token = 'ksxk/712qLe03UWj6OHMH9LUoiHqGcK+Ve5t/bRQ8+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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