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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f14346767d770607b7ad29a7bedd1a066ba61994dacfaf542c69bbb9e392e2c' 
  AND token = '5pGeOLilMn2B8OEQsWtWMu1+BuiW97W6pTgjlz2hXvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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