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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc68b98c08fe38da556539c8d9c24dfd3e141d480c5a93b2f01d149194bb58ff' 
  AND token = 'KKziP9ks+6bDz4VQ6aIuLOY676U2yfW64LZHx2xLwr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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