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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79d77878d244390962626b78d4439249af5fd396a7519f3afbe29ba761f1a0d' 
  AND token = '45+B6tduRzu7W6vI0dw5AExS0zog5Gv9ZxI42p1njkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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