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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c11ebbf286c2649ff8ab7582941466797d0d30bc4f609ef536a3bfed6f0312f' 
  AND token = '2vmyfFJCGEYbQj2psk0s4K6kBtUK9x2i/dW8325wqsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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