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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2496673d2567df9d5fa7dfec799e2ac2767cc344adaed8b2fad98ae1e9f5abd' 
  AND token = '1GxRpNGebkUg0hS1PAWi19SrgRQnvoZv5DtpgkUua/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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