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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da2cf96aa46636e8e17656e4499c395fed348bbb343ed306f7a98c03bc2ffea' 
  AND token = 'KsGnkLLCmfGy4NK9hRq86Fzseak7ktZp3z/mRzTliwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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