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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb244f5a61819c728d72003329792a1fca500a33ba7745fa549db041dd2391e5' 
  AND token = 'jTNUBY12fCRi5d3nHW7Qy7U51Qm7H54lWMOc+2f0XRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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