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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4701cb36e683b9f115bd17255a9b48b834650d049245773d5df6211ac406bea' 
  AND token = 'E9WVD5JV47P+bwjC98TaiAbdP3u+1v0e8xA1f1NI2Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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