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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714f8787d9ee588159941e98374c90cc78724aa1af5ee61e927b07b07316d95f' 
  AND token = '+8V1sT8h+HcOpBhmvSoHcWpXJrXtWc3pIZdXREw250Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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