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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f73fbe0a735dd5f20782d150273e939312318e810f742038045f5fee0a93cc' 
  AND token = '783pDHUBpxOT7cVmq56m7m/9RGKJsMyi5bVofLtYoOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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