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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2f19dcba8c7690b10b6ac949265486c4bd7e410b9a5651415515e2b457bc22' 
  AND token = 'Y0OrH8R/hHltbyFEfTw9zwHP7L8yvyt4yla+I2ekkeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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