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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1ef83a16e5ad9de1ee7620232ca980262fd40d4e3c6a24fe54b962615da2ad' 
  AND token = '2H0DCp2C9Np0RHk+h0GyN7Z2HnDCcBTkhK/PIy8WWMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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