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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94fbcd56c6d0e74171ebb4176e26fd08ca27f0acced4c4545c86839ddc11500' 
  AND token = 'ZwdXU+19SJUj0nZQRXYf2pI4VeZmBeVzcAFm5G7dY7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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